日历getTimeInMillis（）是时区依赖吗？ [英] Calendar getTimeInMillis() is timezone-dependent?

问题描述

Java：时区，为什么不同的时区给出相同的值以毫秒为单位

指向上面的链接我假设Calendar类的getTimeInMillis（）返回独立于时区的毫秒数。

但使用以下代码：

  Calendar cal = Calendar.getInstance 
 int dateInSeconds =（int）（cal.getTimeInMillis（）/ 1000）; 
 Log.i（SECONDS TIME：，+ dateInSeconds）; 
  

尝试，首先，将我的系统时钟设置为10:00和GMT + 02：00

产生一定的输出数。但将系统时钟设置为10:00和GMT + 00：00

输出数字大约比前一种情况大7200，这相当于大约2小时。 p>

为什么？

解决方案

获取独立于时区的毫秒数我找到以下解决方案

而不是：

  int dateInSeconds = （int）（cal.getTimeInMillis（）/ 1000）; 
  

我使用：

  int dateInSeconds =（int）（（cal.getTimeInMillis（）+ cal.getTimeZone（）。getOffset（cal.getTimeInMillis（）））/ 1000）; 
  

它对我有用。

Java: Timezone why different timezone give same value in millisec

referring to the above link I have supposed that getTimeInMillis() of Calendar class returns the number of milliseconds independently from time zone.

But using the following code:

 Calendar cal = Calendar.getInstance();
 int dateInSeconds = (int)(cal.getTimeInMillis()/1000);
 Log.i("TIME IN SECONDS: ",""+dateInSeconds);

tried,at first, to set my system clock to 10:00 and GMT+02:00

producing a certain output number. But setting system clock to 10:00 and GMT+00:00

the output number is about 7200 greater than the prior case, which correspons to about 2 hours.

Why?

解决方案

For obtaining the number of milliseconds independent to time zone I found the following solution

Instead of:

 int dateInSeconds = (int)(cal.getTimeInMillis()/1000);

I use:

 int dateInSeconds = (int)((cal.getTimeInMillis()+cal.getTimeZone().getOffset(cal.getTimeInMillis()))/1000);

it works good for me.

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